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How to make working diagram models by Langman, H. R. Material type:  Text Publication details: London The Technical 1953Availability: Items available for loan: 1 Call number: 621.3, L22H.
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Eletrieal handieraft by langman, H.R. Material type: Text; Format:
print
; Nature of contents:  Availability: Items available for loan: 1 Call number: 621.317 L 22 E.
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